Ducati 125 Regolarita




Make Model.

Ducati 125 Regolarita




3486 units


Two stroke, single cylinder, piston port


123.7 cc / 7.5 cu in
Bore x Stroke 54 x 54 mm
Compression Ratio 10.5:1
Cooling System Air cooled


Dell'Orto PHB30 carburetor


6V 75W flywheel magneto


6V, 7Ah



Max Power

16.3 kW / 21.8 hp


Wet, multiplate



Final Drive


Front Suspension

Telescopic fork

Rear Suspension

Swingarm, dual chocks

Front Brakes

Drum, 125 mm

Rear Brakes

Drum, 140 mm

Front Tyre

3.00 x 21, Metzeler Six Days

Rear Tyre

3.75 x 18, Metzeler Six Days


Length: 2160 mm / 85.0 in
Width:    920 mm / 36.2 in


1420 mm / 55.9 in

Dry Weight

108 kg / 238 lbs

Fuel Capacity 

7.3 L / 1.9 Us gal / 1.6 Imp gal

Top Speed

119 km/h / 74 mph

There was a point in Ducati’s history when everything wasn’t so hunky-dory for the Italian automaker. Back in the 70’s, Ducati was in the middle of one of the worst stretches in its history, having failed to catch on to the 250-, 350-, and 450-cc markets.

Nevertheless, Ducati soldiered on, and from 1975-1977, they were able to build a bike - the 125 Regolarita Six Days - that ended up being one of the rarest Ducati models in history.

The scarcity of this bike doesn’t have anything to do with the modest power train - a 124 cc two-stroke single engine that’s mated to a six-speed transmission - nor does it have anything to do with the relatively heavy frame either (it weighs 238 lbs!).

People are going crazy for this model today because the bike was cancelled relatively early in its production cycle, making it one of the most difficult bikes to get a hold of.

The bike had an expected auction price of €3,500 - €4,500, which is around $4,500 - $5,800 based on current exchange rates, when it went up for auction at the 2012 RM Auctions in Monaco. Actual selling price was $8,333.